mysql - 具有多个参数和返回类型的存储函数

Question

我正在尝试实现以下存储过程，但它没有被创建:

  DELIMITER  //
CREATE Function 'geodistkm'   
(lat1  FLOAT ,  lon1  FLOAT,  lat2 FLOAT ,  lon2 FLOAT) 
returns FLOAT
BEGIN
 DECLARE pi, q1, q2, q3 FLOAT;
 DECLARE rads FLOAT DEFAULT 0;
 SET pi = PI();
 SET lat1 = lat1 * pi / 180;
 SET lon1 = lon1 * pi / 180;
 SET lat2 = lat2 * pi / 180;
 SET lon2 = lon2 * pi / 180;
 SET q1 = COS(lon1-lon2);
 SET q2 = COS(lat1-lat2);
 SET q3 = COS(lat1+lat2);
 SET rads = ACOS( 0.5*((1.0+q1)*q2 - (1.0-q1)*q3) ); 
 RETURN 6378.388 * rads;
END ;
//

DELIMITER ;

我似乎无法弄清楚它出了什么问题。

Answer 1

进行了以下更改:

DELIMITER  //
CREATE FUNCTION  geodistkm  
(lat1  FLOAT ,  lon1  FLOAT,  lat2 FLOAT ,  lon2 FLOAT) 
RETURNS  FLOAT
BEGIN
 DECLARE pi, q1, q2, q3 FLOAT;
 DECLARE rads FLOAT DEFAULT 0;
 SET pi = PI();
 SET lat1 = lat1 * pi / 180;
 SET lon1 = lon1 * pi / 180;
 SET lat2 = lat2 * pi / 180;
 SET lon2 = lon2 * pi / 180;
 SET q1 = COS(lon1-lon2);
 SET q2 = COS(lat1-lat2);
 SET q3 = COS(lat1+lat2);
 SET rads = ACOS( 0.5*((1.0+q1)*q2 - (1.0-q1)*q3) ); 
 RETURN 6378.388 * rads;
END //


DELIMITER ;